Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Income Taxes
Valuation allowance	$ 867,976	$ 747,090
Deferred tax assets
Net operating loss carryforwards	504,968	395,139
Research and development tax credit carryforwards	93,942	90,759
Capitalized research costs	247,223	173,991
Reserves and accruals	35,180	23,928
Lease liabilities	33,124	26,649
Stock based compensation	56,734	47,864
Intangible assets		8,846
Other	6,498	5,583
Total deferred tax assets before valuation allowance	977,669	772,759
Less: valuation allowance	(867,976)	(747,090)
Total deferred tax assets after valuation allowance	109,693	25,669
Deferred tax liabilities
Fixed assets	(11,464)	(4,164)
Right-of-use lease assets	(26,820)	(21,505)
Developed technology	(72,110)
Total deferred tax liabilities	(110,394)	(25,669)
Net deferred tax liabilities	$ (701)